Improvement in grate-bars



G. H. CLARKE & O. VAN WAGENEN Grate-Bars.

No. 210,499. Patented Dec. 3,18 78.

UNITED STATES PATENT OEEIoE.

GEORGE H. CLARKE, OF BROOKLYN, AND CHARLES VAN WAGENEN, OF NEW YORK, N.Y.; SAID VAN WAGENEN ASSIGNOR TO SAID CLARKE.

Specification forming part of Letters Patent No. 210,499, dated December3, 1878; application filed October 23, 1878.

To all whom it may concern Be it known that we, GEORGE H. CLARKE, ofBrooklyn, county of Kings, State of New York, and CHARLES VAN WAGENEN,of New York, county and State of New York, have invented certain new anduseful Improvements in Grate-Bars, of which the following is aspecification This invention relates to furnace grate-bars; and consistsinforming a compoundbar of longitudinal transversely-archedbars,madenarrow-. er at the under side than at the upper side, tofacilitate the passage of the air to the fuel. They are connectedtogether by straight transverse bars (made somewhat deeper than thearched bars them selves) at the junctures of the curved sections, thespaces between the arched bars being about equal to the width of thearched bars, and as the lengths of the corrugations are about eighttimes the width of the arched bars, the air-spaces are a series ofparallel longitudinal narrow openings, thus allowing the freeapplication of the rake beneath.

By means of the corrugated surface more air-surface is presented to thefire than with fiat-top grate-bars in the proportion of the arcs of thecurved sections to their chords, and as the corrugations are indirection lengthwise of the bar no obstruction is offered to the properslicing of the fire, and the liability of their getting'broken duringsuch operation, or warping from unequal heating, is reduced to aminimum.

To make the bars sufficiently strong, one or more of the arched bars isor are continued downward.

The number of the arched bars combined together, the corrugationsthereon, and the number of them continued downward, will be governed bythe conditions under which they are used.

The transverse bars extend beyond the strip at one side of the bar adistance equal to the width of the air-spaces and meet the straight sideof the next bar, so that the whole of the furnace area is perfectlyuniform as to position and size of the air-spaces.

To describe our invention more particularly we will refer to theaccompanying drawings, forming part of this specification, in which-Figure 1 is a plan view of our improved grate-bar. Fig. 2 is alongitudinal sectional elevation, and Fig. 3 is a transverse sectiontaken on the line .00 m.

a to represent the longitudinal strips, the sides of which are straightand parallel, as shown in the plan view, Fig. 1, but are formed, asshown at Fig. 2, into a series of curves, to, whose convex sides areupward. These strips a a are connected together at the junctures of thecurves a a by means of the transverse bars I) I), which are somewhatdeeper than the strips a a. The two end ones, b 72 act as guides to keepthe bars on the bearers of the furnaces, the bar resting on the extremeends of the strips a a.

Two of the strips (0 a extend downward and form the deep ribs 0 0, theybeing lengthwise of the bar, their ends meeting the transverse bars I)bl; or the construction of the bar may be described as consisting of acorrugated plate, a (1, having a series of parallel longitudinal slits,a a strengthened transversely by the bars I) b and longitudinally by theribs 0 c. The lugs b b regulate the space between the adjoining bars.

What we claim as new, and desire to secure by Letters Patent, is

The furnace grate-barhereinbefore described, consisting of a series oftransversely-"arched bars, a a, connected together by the bars I) b toform a section, and strengthened longitudinally by continuing one ormore of the bars a a downward, substantially as set forth.

in witness whereof we have hereunto set our hands this 21st day ofOctober, 1878.

eEo. H. CLARKE. CHARLES VAN WAGENEN.

Witnesses W. WALBAUOK, H. 1). WILLIAMS.

